diskutil.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <sys/time.h>
   4 #include <sys/types.h>
   5 #include <sys/stat.h>
   6 #include <dirent.h>
   7 #include <libgen.h>
   8 #include <math.h>
   9
  10 #include "fio.h"
  11 #include "smalloc.h"
  12 #include "diskutil.h"
  13
  14 static int last_majdev, last_mindev;
  15 static struct disk_util *last_du;
  16
  17 static struct fio_mutex *disk_util_mutex;
  18
  19 FLIST_HEAD(disk_list);
  20
  21 static struct disk_util *__init_per_file_disk_util(struct thread_data *td,
  22                 int majdev, int mindev, char *path);
  23
  24 static void disk_util_free(struct disk_util *du)
  25 {
  26         if (du == last_du)
  27                 last_du = NULL;
  28
  29         while (!flist_empty(&du->slaves)) {
  30                 struct disk_util *slave;
  31
  32                 slave = flist_entry(du->slaves.next, struct disk_util, slavelist);
  33                 flist_del(&slave->slavelist);
  34                 slave->users--;
  35         }
  36
  37         fio_mutex_remove(du->lock);
  38         sfree(du);
  39 }
  40
  41 static int get_io_ticks(struct disk_util *du, struct disk_util_stat *dus)
  42 {
  43         unsigned in_flight;
  44         unsigned long long sectors[2];
  45         char line[256];
  46         FILE *f;
  47         char *p;
  48         int ret;
  49
  50         dprint(FD_DISKUTIL, "open stat file: %s\n", du->path);
  51
  52         f = fopen(du->path, "r");
  53         if (!f)
  54                 return 1;
  55
  56         p = fgets(line, sizeof(line), f);
  57         if (!p) {
  58                 fclose(f);
  59                 return 1;
  60         }
  61
  62         dprint(FD_DISKUTIL, "%s: %s", du->path, p);
  63
  64         ret = sscanf(p, "%u %u %llu %u %u %u %llu %u %u %u %u\n",
  65                                         &dus->s.ios[0],
  66                                         &dus->s.merges[0], &sectors[0],
  67                                         &dus->s.ticks[0], &dus->s.ios[1],
  68                                         &dus->s.merges[1], &sectors[1],
  69                                         &dus->s.ticks[1], &in_flight,
  70                                         &dus->s.io_ticks,
  71                                         &dus->s.time_in_queue);
  72         fclose(f);
  73         dprint(FD_DISKUTIL, "%s: stat read ok? %d\n", du->path, ret == 1);
  74         dus->s.sectors[0] = sectors[0];
  75         dus->s.sectors[1] = sectors[1];
  76         return ret != 11;
  77 }
  78
  79 static void update_io_tick_disk(struct disk_util *du)
  80 {
  81         struct disk_util_stat __dus, *dus, *ldus;
  82         struct timeval t;
  83
  84         if (!du->users)
  85                 return;
  86         if (get_io_ticks(du, &__dus))
  87                 return;
  88
  89         dus = &du->dus;
  90         ldus = &du->last_dus;
  91
  92         dus->s.sectors[0] += (__dus.s.sectors[0] - ldus->s.sectors[0]);
  93         dus->s.sectors[1] += (__dus.s.sectors[1] - ldus->s.sectors[1]);
  94         dus->s.ios[0] += (__dus.s.ios[0] - ldus->s.ios[0]);
  95         dus->s.ios[1] += (__dus.s.ios[1] - ldus->s.ios[1]);
  96         dus->s.merges[0] += (__dus.s.merges[0] - ldus->s.merges[0]);
  97         dus->s.merges[1] += (__dus.s.merges[1] - ldus->s.merges[1]);
  98         dus->s.ticks[0] += (__dus.s.ticks[0] - ldus->s.ticks[0]);
  99         dus->s.ticks[1] += (__dus.s.ticks[1] - ldus->s.ticks[1]);
 100         dus->s.io_ticks += (__dus.s.io_ticks - ldus->s.io_ticks);
 101         dus->s.time_in_queue += (__dus.s.time_in_queue - ldus->s.time_in_queue);
 102
 103         fio_gettime(&t, NULL);
 104         dus->s.msec += mtime_since(&du->time, &t);
 105         memcpy(&du->time, &t, sizeof(t));
 106         memcpy(&ldus->s, &__dus.s, sizeof(__dus.s));
 107 }
 108
 109 int update_io_ticks(void)
 110 {
 111         struct flist_head *entry;
 112         struct disk_util *du;
 113         int ret = 0;
 114
 115         dprint(FD_DISKUTIL, "update io ticks\n");
 116
 117         fio_mutex_down(disk_util_mutex);
 118
 119         if (!disk_util_exit) {
 120                 flist_for_each(entry, &disk_list) {
 121                         du = flist_entry(entry, struct disk_util, list);
 122                         update_io_tick_disk(du);
 123                 }
 124         } else
 125                 ret = 1;
 126
 127         fio_mutex_up(disk_util_mutex);
 128         return ret;
 129 }
 130
 131 static struct disk_util *disk_util_exists(int major, int minor)
 132 {
 133         struct flist_head *entry;
 134         struct disk_util *du;
 135
 136         fio_mutex_down(disk_util_mutex);
 137
 138         flist_for_each(entry, &disk_list) {
 139                 du = flist_entry(entry, struct disk_util, list);
 140
 141                 if (major == du->major && minor == du->minor) {
 142                         fio_mutex_up(disk_util_mutex);
 143                         return du;
 144                 }
 145         }
 146
 147         fio_mutex_up(disk_util_mutex);
 148         return NULL;
 149 }
 150
 151 static int get_device_numbers(char *file_name, int *maj, int *min)
 152 {
 153         struct stat st;
 154         int majdev, mindev;
 155         char tempname[PATH_MAX], *p;
 156
 157         if (!lstat(file_name, &st)) {
 158                 if (S_ISBLK(st.st_mode)) {
 159                         majdev = major(st.st_rdev);
 160                         mindev = minor(st.st_rdev);
 161                 } else if (S_ISCHR(st.st_mode)) {
 162                         majdev = major(st.st_rdev);
 163                         mindev = minor(st.st_rdev);
 164                         if (fio_lookup_raw(st.st_rdev, &majdev, &mindev))
 165                                 return -1;
 166                 } else if (S_ISFIFO(st.st_mode))
 167                         return -1;
 168                 else {
 169                         majdev = major(st.st_dev);
 170                         mindev = minor(st.st_dev);
 171                 }
 172         } else {
 173                 /*
 174                  * must be a file, open "." in that path
 175                  */
 176                 strncpy(tempname, file_name, PATH_MAX - 1);
 177                 p = dirname(tempname);
 178                 if (stat(p, &st)) {
 179                         perror("disk util stat");
 180                         return -1;
 181                 }
 182
 183                 majdev = major(st.st_dev);
 184                 mindev = minor(st.st_dev);
 185         }
 186
 187         *min = mindev;
 188         *maj = majdev;
 189
 190         return 0;
 191 }
 192
 193 static int read_block_dev_entry(char *path, int *maj, int *min)
 194 {
 195         char line[256], *p;
 196         FILE *f;
 197
 198         f = fopen(path, "r");
 199         if (!f) {
 200                 perror("open path");
 201                 return 1;
 202         }
 203
 204         p = fgets(line, sizeof(line), f);
 205         fclose(f);
 206
 207         if (!p)
 208                 return 1;
 209
 210         if (sscanf(p, "%u:%u", maj, min) != 2)
 211                 return 1;
 212
 213         return 0;
 214 }
 215
 216 static void find_add_disk_slaves(struct thread_data *td, char *path,
 217                                  struct disk_util *masterdu)
 218 {
 219         DIR *dirhandle = NULL;
 220         struct dirent *dirent = NULL;
 221         char slavesdir[PATH_MAX], temppath[PATH_MAX], slavepath[PATH_MAX];
 222         struct disk_util *slavedu = NULL;
 223         int majdev, mindev;
 224         ssize_t linklen;
 225
 226         sprintf(slavesdir, "%s/%s", path, "slaves");
 227         dirhandle = opendir(slavesdir);
 228         if (!dirhandle)
 229                 return;
 230
 231         while ((dirent = readdir(dirhandle)) != NULL) {
 232                 if (!strcmp(dirent->d_name, ".") ||
 233                     !strcmp(dirent->d_name, ".."))
 234                         continue;
 235
 236                 sprintf(temppath, "%s%s%s", slavesdir, FIO_OS_PATH_SEPARATOR, dirent->d_name);
 237                 /* Can we always assume that the slaves device entries
 238                  * are links to the real directories for the slave
 239                  * devices?
 240                  */
 241                 linklen = readlink(temppath, slavepath, PATH_MAX - 1);
 242                 if (linklen  < 0) {
 243                         perror("readlink() for slave device.");
 244                         closedir(dirhandle);
 245                         return;
 246                 }
 247                 slavepath[linklen] = '\0';
 248
 249                 sprintf(temppath, "%s/%s/dev", slavesdir, slavepath);
 250                 if (read_block_dev_entry(temppath, &majdev, &mindev)) {
 251                         perror("Error getting slave device numbers.");
 252                         closedir(dirhandle);
 253                         return;
 254                 }
 255
 256                 /*
 257                  * See if this maj,min already exists
 258                  */
 259                 slavedu = disk_util_exists(majdev, mindev);
 260                 if (slavedu)
 261                         continue;
 262
 263                 sprintf(temppath, "%s%s%s", slavesdir, FIO_OS_PATH_SEPARATOR, slavepath);
 264                 __init_per_file_disk_util(td, majdev, mindev, temppath);
 265                 slavedu = disk_util_exists(majdev, mindev);
 266
 267                 /* Should probably use an assert here. slavedu should
 268                  * always be present at this point. */
 269                 if (slavedu) {
 270                         slavedu->users++;
 271                         flist_add_tail(&slavedu->slavelist, &masterdu->slaves);
 272                 }
 273         }
 274
 275         closedir(dirhandle);
 276 }
 277
 278 static struct disk_util *disk_util_add(struct thread_data *td, int majdev,
 279                                        int mindev, char *path)
 280 {
 281         struct disk_util *du, *__du;
 282         struct flist_head *entry;
 283         int l;
 284
 285         dprint(FD_DISKUTIL, "add maj/min %d/%d: %s\n", majdev, mindev, path);
 286
 287         du = smalloc(sizeof(*du));
 288         if (!du) {
 289                 log_err("fio: smalloc() pool exhausted\n");
 290                 return NULL;
 291         }
 292
 293         memset(du, 0, sizeof(*du));
 294         INIT_FLIST_HEAD(&du->list);
 295         l = snprintf(du->path, sizeof(du->path), "%s/stat", path);
 296         if (l < 0 || l >= sizeof(du->path)) {
 297                 log_err("constructed path \"%.100s[...]/stat\" larger than buffer (%zu bytes)\n",
 298                         path, sizeof(du->path) - 1);
 299                 sfree(du);
 300                 return NULL;
 301         }
 302         strncpy((char *) du->dus.name, basename(path) - 1, FIO_DU_NAME_SZ);
 303         du->sysfs_root = path;
 304         du->major = majdev;
 305         du->minor = mindev;
 306         INIT_FLIST_HEAD(&du->slavelist);
 307         INIT_FLIST_HEAD(&du->slaves);
 308         du->lock = fio_mutex_init(FIO_MUTEX_UNLOCKED);
 309         du->users = 0;
 310
 311         fio_mutex_down(disk_util_mutex);
 312
 313         flist_for_each(entry, &disk_list) {
 314                 __du = flist_entry(entry, struct disk_util, list);
 315
 316                 dprint(FD_DISKUTIL, "found %s in list\n", __du->dus.name);
 317
 318                 if (!strcmp((char *) du->dus.name, (char *) __du->dus.name)) {
 319                         disk_util_free(du);
 320                         fio_mutex_up(disk_util_mutex);
 321                         return __du;
 322                 }
 323         }
 324
 325         dprint(FD_DISKUTIL, "add %s to list\n", du->dus.name);
 326
 327         fio_gettime(&du->time, NULL);
 328         get_io_ticks(du, &du->last_dus);
 329
 330         flist_add_tail(&du->list, &disk_list);
 331         fio_mutex_up(disk_util_mutex);
 332
 333         find_add_disk_slaves(td, path, du);
 334         return du;
 335 }
 336
 337 static int check_dev_match(int majdev, int mindev, char *path)
 338 {
 339         int major, minor;
 340
 341         if (read_block_dev_entry(path, &major, &minor))
 342                 return 1;
 343
 344         if (majdev == major && mindev == minor)
 345                 return 0;
 346
 347         return 1;
 348 }
 349
 350 static int find_block_dir(int majdev, int mindev, char *path, int link_ok)
 351 {
 352         struct dirent *dir;
 353         struct stat st;
 354         int found = 0;
 355         DIR *D;
 356
 357         D = opendir(path);
 358         if (!D)
 359                 return 0;
 360
 361         while ((dir = readdir(D)) != NULL) {
 362                 char full_path[256];
 363
 364                 if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."))
 365                         continue;
 366
 367                 sprintf(full_path, "%s%s%s", path, FIO_OS_PATH_SEPARATOR, dir->d_name);
 368
 369                 if (!strcmp(dir->d_name, "dev")) {
 370                         if (!check_dev_match(majdev, mindev, full_path)) {
 371                                 found = 1;
 372                                 break;
 373                         }
 374                 }
 375
 376                 if (link_ok) {
 377                         if (stat(full_path, &st) == -1) {
 378                                 perror("stat");
 379                                 break;
 380                         }
 381                 } else {
 382                         if (lstat(full_path, &st) == -1) {
 383                                 perror("stat");
 384                                 break;
 385                         }
 386                 }
 387
 388                 if (!S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode))
 389                         continue;
 390
 391                 found = find_block_dir(majdev, mindev, full_path, 0);
 392                 if (found) {
 393                         strcpy(path, full_path);
 394                         break;
 395                 }
 396         }
 397
 398         closedir(D);
 399         return found;
 400 }
 401
 402 static struct disk_util *__init_per_file_disk_util(struct thread_data *td,
 403                                                    int majdev, int mindev,
 404                                                    char *path)
 405 {
 406         struct stat st;
 407         char tmp[PATH_MAX];
 408         char *p;
 409
 410         /*
 411          * If there's a ../queue/ directory there, we are inside a partition.
 412          * Check if that is the case and jump back. For loop/md/dm etc we
 413          * are already in the right spot.
 414          */
 415         sprintf(tmp, "%s/../queue", path);
 416         if (!stat(tmp, &st)) {
 417                 p = dirname(path);
 418                 sprintf(tmp, "%s/queue", p);
 419                 if (stat(tmp, &st)) {
 420                         log_err("unknown sysfs layout\n");
 421                         return NULL;
 422                 }
 423                 strncpy(tmp, p, PATH_MAX - 1);
 424                 sprintf(path, "%s", tmp);
 425         }
 426
 427         if (td->o.ioscheduler && !td->sysfs_root)
 428                 td->sysfs_root = strdup(path);
 429
 430         return disk_util_add(td, majdev, mindev, path);
 431 }
 432
 433 static struct disk_util *init_per_file_disk_util(struct thread_data *td,
 434                                                  char *filename)
 435 {
 436
 437         char foo[PATH_MAX];
 438         struct disk_util *du;
 439         int mindev, majdev;
 440
 441         if (get_device_numbers(filename, &majdev, &mindev))
 442                 return NULL;
 443
 444         dprint(FD_DISKUTIL, "%s belongs to maj/min %d/%d\n", filename, majdev,
 445                         mindev);
 446
 447         du = disk_util_exists(majdev, mindev);
 448         if (du) {
 449                 if (td->o.ioscheduler && !td->sysfs_root)
 450                         td->sysfs_root = strdup(du->sysfs_root);
 451
 452                 return du;
 453         }
 454
 455         /*
 456          * for an fs without a device, we will repeatedly stat through
 457          * sysfs which can take oodles of time for thousands of files. so
 458          * cache the last lookup and compare with that before going through
 459          * everything again.
 460          */
 461         if (mindev == last_mindev && majdev == last_majdev)
 462                 return last_du;
 463
 464         last_mindev = mindev;
 465         last_majdev = majdev;
 466
 467         sprintf(foo, "/sys/block");
 468         if (!find_block_dir(majdev, mindev, foo, 1))
 469                 return NULL;
 470
 471         return __init_per_file_disk_util(td, majdev, mindev, foo);
 472 }
 473
 474 static struct disk_util *__init_disk_util(struct thread_data *td,
 475                                           struct fio_file *f)
 476 {
 477         return init_per_file_disk_util(td, f->file_name);
 478 }
 479
 480 void init_disk_util(struct thread_data *td)
 481 {
 482         struct fio_file *f;
 483         unsigned int i;
 484
 485         if (!td->o.do_disk_util ||
 486             (td->io_ops->flags & (FIO_DISKLESSIO | FIO_NODISKUTIL)))
 487                 return;
 488
 489         for_each_file(td, f, i)
 490                 f->du = __init_disk_util(td, f);
 491 }
 492
 493 static void show_agg_stats(struct disk_util_agg *agg, int terse)
 494 {
 495         if (!agg->slavecount)
 496                 return;
 497
 498         if (!terse) {
 499                 log_info(", aggrios=%u/%u, aggrmerge=%u/%u, aggrticks=%u/%u,"
 500                                 " aggrin_queue=%u, aggrutil=%3.2f%%",
 501                                 agg->ios[0] / agg->slavecount,
 502                                 agg->ios[1] / agg->slavecount,
 503                                 agg->merges[0] / agg->slavecount,
 504                                 agg->merges[1] / agg->slavecount,
 505                                 agg->ticks[0] / agg->slavecount,
 506                                 agg->ticks[1] / agg->slavecount,
 507                                 agg->time_in_queue / agg->slavecount,
 508                                 agg->max_util.u.f);
 509         } else {
 510                 log_info(";slaves;%u;%u;%u;%u;%u;%u;%u;%3.2f%%",
 511                                 agg->ios[0] / agg->slavecount,
 512                                 agg->ios[1] / agg->slavecount,
 513                                 agg->merges[0] / agg->slavecount,
 514                                 agg->merges[1] / agg->slavecount,
 515                                 agg->ticks[0] / agg->slavecount,
 516                                 agg->ticks[1] / agg->slavecount,
 517                                 agg->time_in_queue / agg->slavecount,
 518                                 agg->max_util.u.f);
 519         }
 520 }
 521
 522 static void aggregate_slaves_stats(struct disk_util *masterdu)
 523 {
 524         struct disk_util_agg *agg = &masterdu->agg;
 525         struct disk_util_stat *dus;
 526         struct flist_head *entry;
 527         struct disk_util *slavedu;
 528         double util;
 529
 530         flist_for_each(entry, &masterdu->slaves) {
 531                 slavedu = flist_entry(entry, struct disk_util, slavelist);
 532                 dus = &slavedu->dus;
 533                 agg->ios[0] += dus->s.ios[0];
 534                 agg->ios[1] += dus->s.ios[1];
 535                 agg->merges[0] += dus->s.merges[0];
 536                 agg->merges[1] += dus->s.merges[1];
 537                 agg->sectors[0] += dus->s.sectors[0];
 538                 agg->sectors[1] += dus->s.sectors[1];
 539                 agg->ticks[0] += dus->s.ticks[0];
 540                 agg->ticks[1] += dus->s.ticks[1];
 541                 agg->time_in_queue += dus->s.time_in_queue;
 542                 agg->slavecount++;
 543
 544                 util = (double) (100 * dus->s.io_ticks / (double) slavedu->dus.s.msec);
 545                 /* System utilization is the utilization of the
 546                  * component with the highest utilization.
 547                  */
 548                 if (util > agg->max_util.u.f)
 549                         agg->max_util.u.f = util;
 550
 551         }
 552
 553         if (agg->max_util.u.f > 100.0)
 554                 agg->max_util.u.f = 100.0;
 555 }
 556
 557 void disk_util_prune_entries(void)
 558 {
 559         fio_mutex_down(disk_util_mutex);
 560
 561         while (!flist_empty(&disk_list)) {
 562                 struct disk_util *du;
 563
 564                 du = flist_entry(disk_list.next, struct disk_util, list);
 565                 flist_del(&du->list);
 566                 disk_util_free(du);
 567         }
 568
 569         last_majdev = last_mindev = -1;
 570         fio_mutex_up(disk_util_mutex);
 571         fio_mutex_remove(disk_util_mutex);
 572 }
 573
 574 void print_disk_util(struct disk_util_stat *dus, struct disk_util_agg *agg,
 575                      int terse)
 576 {
 577         double util = 0;
 578
 579         if (dus->s.msec)
 580                 util = (double) 100 * dus->s.io_ticks / (double) dus->s.msec;
 581         if (util > 100.0)
 582                 util = 100.0;
 583
 584         if (!terse) {
 585                 if (agg->slavecount)
 586                         log_info("  ");
 587
 588                 log_info("  %s: ios=%u/%u, merge=%u/%u, ticks=%u/%u, "
 589                          "in_queue=%u, util=%3.2f%%", dus->name,
 590                                         dus->s.ios[0], dus->s.ios[1],
 591                                         dus->s.merges[0], dus->s.merges[1],
 592                                         dus->s.ticks[0], dus->s.ticks[1],
 593                                         dus->s.time_in_queue, util);
 594         } else {
 595                 log_info(";%s;%u;%u;%u;%u;%u;%u;%u;%3.2f%%",
 596                                         dus->name, dus->s.ios[0],
 597                                         dus->s.ios[1], dus->s.merges[0],
 598                                         dus->s.merges[1], dus->s.ticks[0],
 599                                         dus->s.ticks[1],
 600                                         dus->s.time_in_queue, util);
 601         }
 602
 603         /*
 604          * If the device has slaves, aggregate the stats for
 605          * those slave devices also.
 606          */
 607         show_agg_stats(agg, terse);
 608
 609         if (!terse)
 610                 log_info("\n");
 611 }
 612
 613 void json_array_add_disk_util(struct disk_util_stat *dus,
 614                 struct disk_util_agg *agg, struct json_array *array)
 615 {
 616         struct json_object *obj;
 617         double util = 0;
 618
 619         if (dus->s.msec)
 620                 util = (double) 100 * dus->s.io_ticks / (double) dus->s.msec;
 621         if (util > 100.0)
 622                 util = 100.0;
 623
 624         obj = json_create_object();
 625         json_array_add_value_object(array, obj);
 626
 627         json_object_add_value_string(obj, "name", dus->name);
 628         json_object_add_value_int(obj, "read_ios", dus->s.ios[0]);
 629         json_object_add_value_int(obj, "write_ios", dus->s.ios[1]);
 630         json_object_add_value_int(obj, "read_merges", dus->s.merges[0]);
 631         json_object_add_value_int(obj, "write_merges", dus->s.merges[1]);
 632         json_object_add_value_int(obj, "read_ticks", dus->s.ticks[0]);
 633         json_object_add_value_int(obj, "write_ticks", dus->s.ticks[1]);
 634         json_object_add_value_int(obj, "in_queue", dus->s.time_in_queue);
 635         json_object_add_value_float(obj, "util", util);
 636
 637         /*
 638          * If the device has slaves, aggregate the stats for
 639          * those slave devices also.
 640          */
 641         if (!agg->slavecount)
 642                 return;
 643         json_object_add_value_int(obj, "aggr_read_ios",
 644                                 agg->ios[0] / agg->slavecount);
 645         json_object_add_value_int(obj, "aggr_write_ios",
 646                                 agg->ios[1] / agg->slavecount);
 647         json_object_add_value_int(obj, "aggr_read_merges",
 648                                 agg->merges[0] / agg->slavecount);
 649         json_object_add_value_int(obj, "aggr_write_merge",
 650                                 agg->merges[1] / agg->slavecount);
 651         json_object_add_value_int(obj, "aggr_read_ticks",
 652                                 agg->ticks[0] / agg->slavecount);
 653         json_object_add_value_int(obj, "aggr_write_ticks",
 654                                 agg->ticks[1] / agg->slavecount);
 655         json_object_add_value_int(obj, "aggr_in_queue",
 656                                 agg->time_in_queue / agg->slavecount);
 657         json_object_add_value_float(obj, "aggr_util", agg->max_util.u.f);
 658 }
 659
 660 static void json_object_add_disk_utils(struct json_object *obj,
 661                                        struct flist_head *head)
 662 {
 663         struct json_array *array = json_create_array();
 664         struct flist_head *entry;
 665         struct disk_util *du;
 666
 667         json_object_add_value_array(obj, "disk_util", array);
 668
 669         flist_for_each(entry, head) {
 670                 du = flist_entry(entry, struct disk_util, list);
 671
 672                 aggregate_slaves_stats(du);
 673                 json_array_add_disk_util(&du->dus, &du->agg, array);
 674         }
 675 }
 676
 677 void show_disk_util(int terse, struct json_object *parent)
 678 {
 679         struct flist_head *entry;
 680         struct disk_util *du;
 681
 682         fio_mutex_down(disk_util_mutex);
 683
 684         if (flist_empty(&disk_list)) {
 685                 fio_mutex_up(disk_util_mutex);
 686                 return;
 687         }
 688
 689         if (!terse && !parent)
 690                 log_info("\nDisk stats (read/write):\n");
 691
 692         if (output_format == FIO_OUTPUT_JSON) {
 693                 json_object_add_disk_utils(parent, &disk_list);
 694         } else
 695                 flist_for_each(entry, &disk_list) {
 696                         du = flist_entry(entry, struct disk_util, list);
 697
 698                         aggregate_slaves_stats(du);
 699                         print_disk_util(&du->dus, &du->agg, terse);
 700                 }
 701
 702         fio_mutex_up(disk_util_mutex);
 703 }
 704
 705 void setup_disk_util(void)
 706 {
 707         disk_util_mutex = fio_mutex_init(FIO_MUTEX_UNLOCKED);
 708 }